/Engine/Plugins/Importers/USDImporter/Source/USDSchemas/Public/USDInfoCache.h
Returns the paths to prims that, when translated into assets or components, also require reading the prim at 'Path'. e.g. providing the path to a Shader prim will return the paths to all Material prims for which the translation involves reading that particular Shader.
[TSet](API\Runtime\Core\Containers\TSet)< [UE::FSdfPath](API\Plugins\UnrealUSDWrapper\UsdWrappers\FSdfPath) > GetMainPrims ( const [UE::FSdfPath](API\Plugins\UnrealUSDWrapper\UsdWrappers\FSdfPath) & AuxPrimPath ) const